题目内容

中小柔度压杆的临界载荷可以用欧拉公式计算。

A. 对
B. 错

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The Greens____supper now.

A. is having
B. are;haveing
C. is haveing
D. are;having

Jack is_____with Jim.They are good____.

A. running;friend;
B. running;friends;
C. runing;friends
D. run;friend's

Look! Mary____doing____homework.

A. is;one's
B. is;her
C. are;his
D. are;her

The children are____

A. watch
B. seeing
C. watching
D. reading

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